While the international standard recommends the meter (and its subdivisions in 1000 increments such as the millimeter) as the legal unit of measurement, the inch is still sometimes used to express the size of the screen (i.e. the large diagonal).
One inch is 2.54 cm. A 17-inch screen is a 43 cm screen, already a standard size for television tubes in the 1950s.
The law is skilfully circumvented here, the number of inches, designating a '' class of devices '', hence the elastic value observed for the '' inch ''.In low-vision, the choice of a screen depends on your job and several criteria. For example, you have to take into account the media to read or view, the size, the number of windows to display and your viewing comfort, which includes manual and automated settings and screen orientation.
Overview of criteria and technique.
What is Screen?
Screens are now an integral part of our life. Visually impaired people who can use their sight generally use screens: telephone, electronic magnifying glass, computer, tele-magnifier, television, household appliances. But it can also be outdoor screens: in TER buses and trains, on metro platforms, SNCF screens, and at the airport. Anyway, each visual handicap is specific, whether the vision is monocular, tubular, peripheral, with floaters, more or less clear, or a different perception of colors such as color blindness.
What is a measurement in inches?
The inch is length measurement: 1 inch = 2.54 cm. This metric is used to define screen and device sizes.
- for a single screen, the length of the diagonal of a screen without its border;
- for a device, it's complete diagonal with its border.
The size of a TV screen is expressed by its diagonal in cm or inch. 1 inch = 2.54 cm. This is the main thing to know.To find your way in the jungle of screen dimensions, we give you a summary of the main sizes of TV screens on the market. And then while doing this, we explain the difference between size, format, definition, and screen resolution.When we talk about the TV screen diagonal, we are only talking about the screen and not the TV frame.The screen size given by the manufacturers is the TV diagonal without a frame.
TV Screen size:cm/inch conversion
The recoil distance
Who has never heard or uttered the phrase "kids, are you stepping back from the TV, it damages your eyes"?And yes, once used to refer to CRT televisions, this phrase has lost all meaning today given the picture quality of today's televisions.Indeed, it is no longer necessary to have a minimum distance to enjoy a clear and sharp image, all without damaging the eyes.An appropriate screen size allows you to optimize viewing quality and make the most of High Definition (HD).
The Classic rule
However, a classic rule used in the industry tends to say that the minimum distance between your screen and yourself is 2 to 3 times the diagonal of the television, for optimal comfort.You must therefore calculate the screen size that would best suit the layout of your apartment or house.
About the optimum setback distance:
- If your screen is too large, the image will appear pixelated (loss of detail)
- If your screen is too small, we will not benefit from the quality of the TV because we will not perceive all the details
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